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Out of curiosity, do you have an approximate month of release for Deities & Demigods (1980)?

Alas, my library of TSR annual release catalogs doesn't stretch back that far, and the Dragon magazine of the early 80s are rather unhelpful regarding release months, so you'll see fewer and fewer months listed as we progress backwards in time

I don't remember, but if you dig back through Gary's "From the Sorcerer's Scroll" columns in 1979 and 1980, you should be able to guesstimate a release date. There's probably some info about this over at the Acaeum, too, although a quick check on the D&DG page didn't say anything useful re: release dates.